Hydroprocessing of heavy hydrocarbon feeds

Abstract

Heavy oil feeds are hydroprocessed in the presence of a solvent under conditions that provide a variety of benefits. The solvent can be an added solvent or a portion of the liquid effluent from hydroprocessing. The processes allow for lower pressure processing of heavy oil feeds for extended processing times or extended catalyst lifetimes be reducing or mitigating the amount of coke formation on the hydroprocessing catalyst.

The invention claimed is:  
     
       1. A process for producing a hydroprocessed product, comprising:
 exposing a combined feedstock comprising a heavy oil feed component and a solvent component to a hydroprocessing catalyst under effective hydroprocessing conditions to form a hydroprocessed effluent, the effective hydroprocessing conditions including a partial pressure of hydrogen of about 1000 psia (6.9 MPa) or less, a temperature of at least about 360° C., and a liquid hourly space velocity of the fraction of the combined feedstock boiling above 1050° F. (566° C.) of at least about 0.10 hr −1 ; 
 separating the hydroprocessing effluent to form at least a liquid effluent; and 
 fractionating a first portion of the liquid effluent to form at least a distillate product and a bottoms product, the bottoms product having an ASTM D6352 distillation point of at least about 600° F. (316° C.); 
 wherein the solvent component comprises at least one single ring aromatic compound in which the solvent has an ASTM D86 10% distillation point of at least 120° C. (248° F.) and a 90% distillation point of not greater than 300° C. (572° F.); and 
 wherein the at least one single-ring aromatic compound is trimethylbenzene. 
 
     
     
       2. The process of  claim 1 , wherein the solvent component comprises a recycle component, the process further comprising recycling a second portion of the liquid effluent to form the recycle component. 
     
     
       3. The process of  claim 2 , wherein the ratio of the recycle component to the heavy oil feed component on a weight basis is from about 0.3 to about 6.0. 
     
     
       4. The process of  claim 1 , wherein the effective hydroprocessing conditions comprise a partial pressure of hydrogen of about 800 psia (5.5 MPa) or less. 
     
     
       5. The process of  claim 1 , wherein the effective hydroprocessing conditions comprise a total pressure of about 1000 psig (6.9 MPag) or less. 
     
     
       6. The process of  claim 1 , wherein the liquid hourly space velocity of the fraction of the combined feedstock boiling above 1050° F. (566° C.) is at least about 0.12 hr −1 . 
     
     
       7. The process of  claim 1 , further comprising performing solvent deasphalting on at least a portion of the bottoms product to form a deasphalted bottoms product and an asphalt product. 
     
     
       8. The process of  claim 7 , wherein the effective hydroprocessing conditions are effective for conversion of from about 50 to about 70% of the 1050° F.+ (566° C.+) portion of the heavy oil feed component. 
     
     
       9. The process of  claim 8 , further comprising performing a vacuum fractionation on at least a portion of the bottoms product to form at least a vacuum gas oil product and a vacuum bottoms product, wherein solvent deasphalting is performed on at least a portion of the vacuum bottoms product. 
     
     
       10. The process of  claim 9 , wherein the heavy oil feed component comprises a first heavy oil feed portion and a second heavy oil feed portion, the method further comprising combining the vacuum bottoms product with the first heavy oil feed portion prior to solvent deasphalting, wherein the combined feedstock comprises the deasphalted bottoms product, the second heavy oil feed portion, and the solvent component. 
     
     
       11. The process of  claim 1 , wherein the solvent comprises at least a portion of the distillate product, at least 90 wt % of the at least a portion of the distillate product having a boiling point in a boiling range of 300° F. (149° C.) to 750° F. (399° C.). 
     
     
       12. The process of  claim 11 , wherein 10 wt % or less of the at least a portion of the distillate product in the combined feedstock is converted to components having a boiling point of less than 300° F. during exposure of the combined feedstock to the effective hydroprocessing conditions. 
     
     
       13. The process of  claim 1 , wherein the solvent component comprises more than one single-ring aromatic compound and none of the single-ring aromatic compounds has a boiling point of greater than 550° F. (288° C.). 
     
     
       14. The process of  claim 1 , wherein the solvent component is comprised of at least 50 wt % of one or more single ring aromatic compounds. 
     
     
       15. The process of  claim 1 , wherein the heavy oil feed component has ASTM D6352 10% distillation point of at least 900° F. (482° C.), the effective hydroprocessing conditions further comprising a temperature of at least about 420° C., the effective hydroprocessing conditions being effective for at least about 90% conversion of the 1050° F.+ (566° C.+) portion of the combined feedstock,
 and wherein the bottoms product has an ASTM D6352 10% distillation point of at least about 650° F. (343° C.), a concentration of wax in the bottoms product being greater than a concentration of wax in the heavy oil feed component of the combined feedstock. 
 
     
     
       16. The process of  claim 15 , wherein the effective hydroprocessing conditions comprise a temperature of at least about 440° C. 
     
     
       17. The process of  claim 1 , wherein the effective hydroprocessing conditions further comprise a temperature of at least about 420° C., the effective hydroprocessing conditions being effective for at least about 80% conversion of the 1050° F.+ (566° C.+) portion of the combined feedstock and at least about 75% desulfurization of the combined feedstock,
 and wherein the bottoms product has an ASTM D6352 10% distillation point of at least about 800° F. (427° C.) and a sulfur content of about 1.0 wt % or less. 
 
     
     
       18. The process of  claim 17 , wherein the heavy oil feed component has an ASTM D6352 10% distillation point of at least 900° F. (482° C.). 
     
     
       19. The process of  claim 18 , wherein the heavy oil feed component has a sulfur content of at least 3 wt %. 
     
     
       20. The process of  claim 19 , wherein the liquid effluent has a sulfur content of less than 5 wt % of the heavy oil feed component and has a metals content of less than 5 wt % of the heavy oil feed component. 
     
     
       21. The process of  claim 20 , wherein the effective hydroprocessing conditions being effective for at least about 90% conversion of the 1050° F.+ (566° C.+) portion of the combined feedstock.